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We analyze the results of a paper on ``Relativistic quantum dynamics of acharged particle in cosmic string spacetime in the presence of magnetic fieldand scalar potential''. We show that the authors did not obtain the spectrum ofthe eigenvalue equation but only one eigenvalue for a specific relationshipbetween model parameters. In particular, the existence of allowed cyclotronfrequencies conjectured by the authors is a mere artifact of the truncationcondition used to obtain exact solutions to the radial eigenvalue equation.

Comment on: "Relativistic quantum dynamics of a charged particle in  cosmic string spacetime in the presence of magnetic field and scalar  potential''. Eur. Phys. J. C (2012) 72:2051